As you know, technical and trade schools are doing very well and most grads find working shortly after graduating if not before.
Being a good salesman is only good for getting your hubby's foot in the door for the first sale. After that, it all comes down to how well the customers are satisfied with the job and the price.
If he is good as you say he is, then the only question is market growth.
Is there any new housing being built in your market?
Here and there.
Mostly in ICK-atha. (City of Libland Evil)